100mm Macro Quandry

I reckon that sounds right. Of course, the advantage of the digital body is that to get that increase in magnification (on the output ), you don't suffer from a loss of light (as you would using a 1.5x convertor) and you can still focus on infinity (which you would lose if using extension tubes).

I'm doing so much more macro work now I'm digital, just because it doesn't cost anything to get the right shot, so you can really devote a lot of shots to a subject, and I can happily use flash, which I was always dubious about on film.

I love digital!

Dan

Daniel, my head hurts ! I know what your saying, I understand most of what I think you are trying to say, but what you are trying to say is, I think difficult for me to think about what you said !

Would I be correct in thinking, ( be aware I live in the 6th dimension and I have no idea what I am talking about ), that if I compare picture to picture, from 35mm and digital, with a 1:1 Macro, the magnification would be the same, but the picture from the digital would appear to be a higher magnification because it is a tighter crop ?

p.s. You and I both know what I'll be doing tomorrow,


where is that bloody Macro lens .......



p.p.p.p.s you know we want to see more of your macro shots . . . . . please . . . . . . .

Hi all,

I thought I'd knock this up to help.




in the above image, the larger (shaded) area relates to the size of the 35mm film plane, and the smaller area in the middle relates to the size of the digital sensor in comparison.

(And no pedantry points for noticing I got the depth of the sensor wrong in relation to it's width.. by the time I'd noticed, I'd already done most of it.. )




The above will be the two images, at a 100% crop.

Hope that helps..

Cheers

Liam

Excellent illustration LiamD, but tell me, is it common practice to refer to zero cropping IE: full image, IE: No cropping, as 100% crop. If it is, it's daft.

Why not just say it's uncropped, or full image, or full frame?

Hi Peter,

I don't know if that's the official term, but it seems to be the prefered phrase for a lot of users here, and as I was illustrating the point specifically for this board I used it..

I do see what you mean though; if a 50% crop reduces the image by 1/2 then a 100% crop should reduce the image to nothing.. :

Cheers

Liam

Excellent diagram Liam - as they say, a picture says a thousand words...

If I say 100% crop (or rather, I think, 100% cropped), I mean that the image shown is shown at 100% size (i.e. no resizing of the original pixel dimensions has been done), but then cropped down so that just a portion of the image remains, rather than show all 3008x2008 pixels.

For example:



Full frame



100% cropped


Maybe I've got the wrong end of the stick. I'd just say 'Full frame'.

But we know what you mean!

Dan

Well I can hardly say no if you ask like that! I'll dig some out and post tomorrow. Any requests? Dragonflies, butterflies, fungi, wasps?

Planning on running some Macro One-Day Workshops next year, as far as I know thay'll all be in Essex, but if there's the demand, I'd be willing to travel!

Dan

Liam,
Just being picky... your diagram should say "Focal distance", not "Hyperfocal distance"
i.e. the "Focal Length"
Matt

Hi Matt,

it did say tat on the first one I posted.. but for some reason I changed it????

I'll change it later on.. just off to work now.

Cheers

Liam

Liam,
No problem! Computers, eh?

Matt

Computers are wonderful when they are firing on all cylinders , but when they're not....

Still I wouldn't like to go back to the days of letter writing. How long would these forum discussions take?

John,
If it weren't for computers... I wouldn't be able to afford my Pentax gear
(Though as the saying goes, familiarity breeds contempt! LOL! )
Matt

JR said:
hmmn...
same could be said for my brain....
javascript:emoticon('')

The computer works okay.. it's just at a disadvantage of having me driving it!!

It's changed now anyway. The beauty of doing these things in Word, is that you don't have to remember to save in the native .psd or .xcf (GIMP) formats, as .doc saves it as "layers" anyway.

Cheers

Liam

Erm... the links don't view now Liam
Matt